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Step 1 Identify the central atom and draw it’s Lewis structure

Draw a L ewis dot diagram for AsCl 3. Step 1 Identify the central atom and draw it’s Lewis structure This is the element with the lowest number of atoms in the formula. As. Draw a L ewis dot diagram for AsCl 3. Step 2 write the Lewis dot structure for all remaining atoms. Cl. Cl. Cl.

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Step 1 Identify the central atom and draw it’s Lewis structure

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  1. Draw a Lewis dot diagram for AsCl3 Step 1 Identify the central atom and draw it’s Lewis structure This is the element with the lowest number of atoms in the formula As

  2. Draw a Lewis dot diagram for AsCl3 Step 2 write the Lewis dot structure for all remaining atoms Cl Cl Cl

  3. Step 3 Connect the Atoms together by pairing up the single electron from different atoms Step 4 Replace shared electron with a dash (a dash represents two shared electrons) Cl As Cl Cl

  4. Step 5 Check that you have included all lone pairs Cl As Cl Cl

  5. WWW We Do! • Draw the Lewis dot diagram for Nitrogen trifluoride NF3

  6. Draw a Lewis dot diagram for AsCl3 Step 1 identify the central atom This is the element with the lowest number of atoms in the formula Step 2 find the number of chemical bonds There are three chlorines attached so three chemical bonds Draw out the molecule Cl – As – Cl Cl

  7. Step 3 Find the total number of valence electrons in the molecule (including any due to charges) As = 5 e- 5 Cl = 7e- x 3 21 Total = 26 Step 4 since both bonds and lone pairs both need 2 electrons so halve the total number of electrons. Subtract the number of bonds 13 electron pairs – 3 bonds = 10 e- pairs

  8. Step 5 add the electron pairs to the outer atoms until full then place remaining pairs on the central atom. (Remember to count each bond as representing two electrons) • Cl– As –Cl • Cl

  9. WWW We Do! • Draw the Lewis dot diagram for Nitrogen trifluoride

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